# 161 questions

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67
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## config required for multiple ble devices

Hi, I am using SDK v12.2 and gcc compiler. S132 softdevice for nrf51 controller.

I am using muliple nrf51 devices to connect each other and share sensor data with each other. I am thinking to set one as central ... (more)

472
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## nRF51 DK soft devices examples not working

Hi,

I have an nRF51 DK, found here https://www.nordicsemi.com/eng/Produc.... I am using SDK V11.0 and S130 V2.0. I am developing on a Linux machine.

I can compile and run the blinky example successfully ... (more)

519
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## Problem in twi/i2c communication receiving data

Hi<br> I'm trying to communicate between nrf51-DK and arduino using twi. I was able to send data from nrf51-DK to arduino using nrf_drv_twi_tx but when I'm trying to send the data from arduino to DK, I'm ... (more)

118
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2
1

## nrf_mesh_init/nrf_mesh_node_config causing MESH ASSERT

I am testing out the Bluetooth Mesh SDK 0.9.1 Alpha using the light control client/server example. The examples have not been modified.

I have set up a nRF52 development kit as the client, and a nRF51 development ... (more)

42
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## FCS errors only in last bit of CRC and not the rest of the packet

I am using the esb_tx example on an nRF51 DK board modified to send BLE advertising packets at 1 KHz.

I am receiving the packets on a BlueTooth sniffer. The contents of packets is fine, but about 5% of the ... (more)

155
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1
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2

## Can nRF51422 or nRF51822 can be used as bluetooth device for Raspberry pi?

Can nRF51422 or nRF51822 can be used as bluetooth device for Raspberry pi?

As I can see on the terminal Linux, the hciconfig log says, raspberry pi 3's Bluetooth device is connected to board with UART Connection.

I'm ... (more)

66
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2
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## How Can I limit Gatt Data bytes that I write? (Not With Zero-Fill)

I created an characteristic that has MAX_Length = 20 Bytes characteristic.

And When I'm trying to write less than 20bytes on this Characteristic, It Always send with 20Bytes with Zero filled data bytes.

For example, I'd like to write ... (more)

203
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## nrfgo studio doesn't see my custom board

Hello all,

I am trying to program my custom board using the debug out from the nrf51-DK. I connect all the needed pins and on the nrfgo select the Segger but when I do this my nrf51-DK resets and it ... (more)

76
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## nRF51 DK won't connect with nRF Toolbox

Hello,

I'm wondering if my nRF DK51 is not broken as it behaves quite strange when trying to connect with a BLE Central (iOS and Android devices). For most of the part everything is ok (flashing, RTT, UART, BLE ... (more)

141
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## Looking for KiCad shield design for nRF51-DK (or nRF52-DK)

Our workshop is using custom PCBs for other manufacturer's developer kits, and I'd like to do a similar shield for our nRF51-DK boards. Can anyone provide a KiCad project file including schematic and board?

98
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1
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1

## What defines the RSSI update rate for nRF51 devices?

I'm working on a project based on the ble_app_uart_c central example in SDK 12.1. I'm polling the RSSI of a Nordic beacon using sd_ble_gap_rssi_get(), and the fastest update in RSSI I can get is between 60 and ... (more)

90
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## NRF51-DK programming custom board problem

I'm trying to program a nRF51822 custom board using Debug out pin P19 of NRF51-DK through Keil MDK, here is the problem I encounter:

To simplify I just use the simple blinky_s130_pca10028 project. First I compile and load the ... (more)

71
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1
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1

## nRF51 DK Dimensions and Drawing Needed

I haven't been able to find a drawing file for the nRF51 Development Kit. Is there one out there?

Ideally, I'd like to get the drawing and a *.STP file for SolidWorks.

360
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3
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## PPK: Unable to connect to the ppk, check debugger connection and make sure pynrfjprog is up to date

I'm trying to use the PPK with an nRF51 dev board, and I'm getting this output whenever I try to start the PPK Software:

Checking installed packages
pyside:      1.2.4
pyqtgraph:   0.10.0
numpy:       1.11 ...
(more)

264
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2

## Windows 10 Problem?

I am using the nrf51-dk on windows 10 and I tried to apply the latest mbed bootloader. After I do that and restart the chip, the device seems to mount and dismount repeatedly. I tried to download a simple program ... (more)

139
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1

## Use RTC or app_timer?

Hello, i need to count 1 or 2 minutes. Someone can recommend me if to do that is easier to use app_timer or RTC?

Which is the value that i have to put in the prescaler?

I work with nRF51 ... (more)

337
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## What are the list of things to mind when porting a project to nRF51 DK Boards?

Hello, this is what I can think of when porting a project, but before that, a little background about my project:

it uses BLE (duh)

it uses uart to print test output

it uses buttons and leds as runtime indication ... (more)

204
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1

## How can i see the RSSI value in nRF51 dk?

Im based in the example of SDK12.0 - MULTILINK_CENTRAL and i have to know the RRSI value in dbm if it is possible from the peripheral device that is connected to me but i couldn't do that.

Somebody can ... (more)

342
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3
1

## SPI pin on nrf51 DK

Hi All,

I have a question about the SPI pin number on nrf51 Dk.

I don't understand when i look into the pca10028.h file, i see this mapping:

#define SPIM0_SCK_PIN       4
#define SPIM0_MOSI_PIN      1
#define SPIM0_MISO_PIN      3
#define ...
(more)

518
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1
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1

## nRF51 GPIO interrupt

Hello,

I am having interface nRF51 with RF receiver. Output of RF receiver connected with GPIO pin of nRF51.

How can I detect interrupt on gpio pin?

Thanks & Regards, Rajneesh

876
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## Advertising service with 128 bit UUID

Hello everyone,

I have 2 chip; Bluegiga and nRF51-DK

I can easily advertise my custom service in Bluegiga chip. As you can see, nRF Connect application shows my service so that i can scan peripherals with service and connect via ... (more)

144
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## nRf905 work as a receiver with nRF51 DK

Hello All,

I am interfacing nRF905 as a receiver mode which are interface with nRF51 DK.

As a transmitter used this module https://www.alibaba.com/product-detai...

Can I receive data from above transmitter in nRF905?

I have ported receiver ... (more)

755
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1
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1

## Issues with Proximity Example

I tried to get the ble_app_proximity example to work today, with either the nRF51-DK, nRF51-Dongle or nRF52-DK, along with the Nordic Connect app on Android.

I encounter the following issues:

With nRF5 SDK v11, the code size became too large ... (more)

112
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## How to configure P0.9 and P0.11 outputs for signal TX and Rx.

I'm trying cominicar me through Termite between the application plate (nRF51-Dk kit) and a device that supports BLE, but the connection between PC and the kit application I am doing through the TX and RX ports. But I can ... (more)

747
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## Problem with UART DFU

Hi,

I'm trying to test the DFU over HCI included in the SDK examples but I can't make it work. This is all the information of the environment I'm using:

• SDK: 10.0.0
• Board: nRF51-DK
• Softdevice ...
(more)

232
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1
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1

Hi I am getting some weird response from my nRF51-DK.

Situation 1: When I try to flash it with the Blinky code (\sdk11\examples\peripheral\blinky\pca10028\s130\arm5_no_packs) it builds, and flashes successfully. But it does not run the ... (more)

1k
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3
1

## problem with RTC counting

Hi guys, I'm facing some trouble to put my rtc working properly. I made a code based on the rtc example but it's not incrementing the time the right way.

Bellow follows my code, it's just to ... (more)

200
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2
1

## Reset Button

Hello, I just run in following issue. I try to configure an UART to send some bytes. To check the configuration, I just let the program loop, after the sending. Attached an osziloskop to the pin where I've expected ... (more)

296
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1

## nRF Blinky mobile application code

In order to teach a class of students using nRF developer boards I'd like to use the nRF Blinky application running on Android, iOS, or whatever mobile platform. The problem is that we don't have the source code ... (more)

305
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## I have programmed nrf51-dk with mbed as well as Kiel but there is a difference

I have programmed nrf51-dk with an example code available at mbed platform,everything works fine except that the ble is visible even if we open bluetooth menu.It is scanned and in the bluetooth scan list. I had read somewhere ... (more)

#### Statistics

• Total users: 24451
• Latest user: Kristin Verdon
• Resolved questions: 10451
• Total questions: 25466

## Recent blog posts

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Posted 2017-09-22 08:27:00 by Rose Martin
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• ### Using millis() like in Arduino.

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• ### Flashing nRF5x firmware using any dumb terminal program via standard serial COM port

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